The bulb was installed in a basement light fixture. The fixture is the old fashioned ceramic base that is open, not recessed. The bulb was pointing down. The switch is a standard on/off wall switch.
I don't think anything about the installation should have led to a problem.
Inverted: Strike One
basement - high vibration load (from steps upstairs): Strike 2
basement - high number of on/off cycles: strike 3
I'd suggest the Phillips brand going forward and read the box for use in enclosed or inverted fixtures. They will say if it's OK.
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